There was nothing in the ark except the two tablets

2 Chronicles 5:1-14
There was nothing in the ark except the two tablets that Moses had placed in it at Horen where the Lord made a covenant with the Israelites after they came out of Egypt.
All the priests who were there had consecrated themselves, regardless of their divisions.
They were accompanied by 120 priests sounding trumpets. The trumpeters and singers joined in unison, as with one voice, to give praise and thanks to the Lord.
He is good; his love endures forever.
The Ark is installed with joyful music and singing and great thanksgiving. The glory of God's presence fill the Temple.
Why?
It is great opening so all the priests come and regardless of their divisions.
There were many trumpets and singers joined in unison, as with one voice. All their heart in one to worship the Lord.
The Ark is a symbol of the Lord, there were two tablet means the words of the Lord everyone has to observe it.
How?
Observe the word of God, eat it leading us no hungry and no thirsty in physical and spiritual life.